Nope. Though I know some have used a Sharpie and crossed out the "Just" of "Just Married" and written in "Almost" or crossed out the "Married" and written in "Engaged."
They don't have the engaged buttons, but at GF I found a lanyard pin that has Mickey proposing to Minnie...its SO cute..(of course i bought it). Maybe that would be an idea? She could wear it on her shirt/hat/bag?